History

Jack Kline II is the Nephilim son of Kelly Kline and Lucifer. Named after Kelly's father,[1] Jack was conceived when Lucifer inhabited the body of President Jefferson Rooney, with whom Kelly was having a relationship. Angels believe that Nephilim are abominations that can destroy worlds upon growing into their full power; as Jack is the son of Lucifer, it was believed he would also be a force of great evil. However, after the Nephilim, while in utero, gives Castiel a glimpse of the future, Castiel believes Jack will bring peace and paradise to Earth.[2]

Following his birth, the Winchesters take him in, both to keep watch over him and to keep him from hurting anyone, while also hoping to use him to access the Apocalypse World where Mary is trapped. Sam is able to connect with him since they both know what it feels like to have a darkness inside them. Jack initially sees Castiel as his father, but when told that Castiel is dead, he became emotionally attached to Sam instead. Jack is also later able to bond with Castiel and understand why he and Kelly trusted him after he brought him back from the Empty.[3] After being slow to accept Jack, Dean eventually declares him a member of Team Free Will.[3] This acceptance allows Jack to see the Winchesters and Castiel as his family.[4]

Characteristics

Jack flashes his eyes.

The offspring of a human and an archangel, Jack Kline is believed to be more powerful than the average Nephilim, as the amount of cosmic energy that went into his conception was powerful enough to be felt by all the angels in Heaven and Earth and the cosmic shock wave was even detected by the British Men of Letters and Donatello Redfield. Due to the energy coming from Jack, Donatello was able to track him, revealing that unlike his father, the energy coming off of Jack is not "dark" or "toxic." Castiel stated that he cannot imagine the power resonating within him. Unlike run-of-the-mill Nephilim who have silver eyes, Jack has gold irises with white sclerae and visible pupils. According to the lore, as Jack grows into his powers, he will become more powerful than his angelic sire, Lucifer. After Jack regains his powers, Donatello states that Jack is probably the most powerful being in the universe.[5]

Jack reveals to Sam that through his connection with his mother, he was able to learn the English language and how life would be dangerous for him. With this knowledge, Jack made the choice to expedite his growth upon birth into young adulthood.

Like an archangel, Jack's grace is able to recharge over time. However, while archangel grace can take anywhere from a month to a century to recharge, Jack's half-human nature means his grace will probably lean more towards the longer end of the scale rather than the shorter end.[1]

Without his powers, Jack is as vulnerable and mortal as a regular human. Due to Jack's reliance on his powers for most of his short life, he at first lacks the skills to hunt and fight like a regular human.[6] After saving Lora without his powers,[7] Jack received proper training in hunting from the Winchesters and Castiel. By the time Jack joined the Winchesters, Castiel, and Rowena in a gorgon hunt months after losing his powers, Jack had gained the skills he needed to hunt successfully without special powers.[8]

As the unnatural union of a human and an archangel, his grace was the element that held his being in balance. After Lucifer steals his grace, his cells begin fighting each other, severely weakening Jack and causing his body to slowly shut down until his eventual death.[9] It is only with Enochian magic powered by a piece of Jack's own soul that Jack's condition was able to be cured and his body sustained in his graceless state.[10] However, this cure did not appear to be permanent and Jack appeared to occasionally need to use the magic to heal his illness when it would return.[8] When using this power, a white light would emit from his pupil. By tapping into the power of his soul using the magic keeping him alive, Jack was able to use several of his powers, albeit at the cost of pieces of his soul.[11][8] After killing the Apocalypse WorldMichael and absorbing his grace, Jack's original Nephilim powers were restored, eliminating the need for him to further tap into the power of his soul.[8]

After death, Jack's soul is able to go to Heaven like a regular human, though his half-angel nature allows him to sense the true nature of his Heaven and leave it. As he is half-angel, the Cosmic Entity believed that Jack's soul belonged in the Empty upon death like all other angels and demons.[10] With his human soul having been burned away to kill Michael, Jack ends up in the Empty following his second death due to his angelic nature.[12]

Powers and abilities

Jack smites three incoming angels in midair.

Angel radio – Jack is able to hear the angel's communication, which also has a debilitating effect on him.[13][4]

Angel wings – Jack can use his wings to protect himself and others from attacks.[14]

Can open Hell Gates. With enough concentration, Jack was able to open a Gate to Hell and call forth the shedim from some of the deepest caverns of Hell to the earth.[15]

Celestial energy – Jack can send out a shock wave of celestial energy when provoked.[13][3]

Concealment – Jack can conceal his energy from angels and demons, preventing himself from being located.[16]

Enochian magic – By tapping into his soul to power the magic, Jack was able to keep himself alive after losing his grace. He would go on to use the Enochian magic to replicate his Nephilim abilities, such as healing and using energy blasts to attack enemies. When Jack used his soul, his pupils would light up with a bright white light, as opposed to his irises shining gold when he had his grace.

Healing – From the womb, Jack was able to heal Kelly Kline's slit wrists and massive blood loss. While empowering Castiel, he also healed the angel's injuries from the fight with Dagon in a matter of seconds.[2] Using the power of his soul, Jack was able to heal Castiel of the gorgon poison when the antidote failed to work.[8] Jack later healed Stacy after accidentally stabbing her with an angel blade.[18]

Interdimensional instability – His celestial energy can cause tears in the fabric of space and time, leading to alternate universes.[19]

Invulnerability – Jack has been shown to be impervious to guns and knives, as well as angel blades.[13][15]

Magical immunity – Jack is shown to be impervious to most spells, including an angel banishing sigil, although it appears to debilitate him as it can still affect his grace.[13] The energy Jack emits can also hide him from tracking spells and scrying.

Mind control – Jack can compel anyone to tell the truth, even archangels.[20] He also compelled everyone on earth to tell the truth.

Power transference – While in utero, Jack was able to temporarily lend Castiel his power to kill Dagon.[2]

Pyrokinesis – When Kelly was pregnant with Jack, he was able to cause a Bible to burn when she placed her hand on it, and he incinerated Dagon when he lent his powers to Castiel. After he is born, Jack is able to leave scorched footprints on the floor.[19] While tapping into the power of his soul, Jack was able to destroy the Apocalypse WorldMichael by burning him away, leaving only his grace for Jack to consume and restore his powers.[8]

Jack displays his newfound telekinesis.

Regeneration – Jack is able to instantly heal any wounds that are incurred.[13][15][3]

Smiting – Like his father, Jack can combust angels into dust.[21] While tapping into the power of his soul, Jack was able to use this to disintegrate several monsters at once.[11]

Super strength – As the child of an archangel, Jack possesses an inhuman amount of strength and resilience.

Teleportation – Jack was one of the few beings in existence that was able to travel via teleporting.[15][3]

Telekinesis – Jack first learns to use his powers by manipulating small objects, like a pencil, at a distance with his mind. When fully developed he can use these powers to cause great harm, such as when he tortures Michael to the point of irreparably damaging his vessel.

Transmutation – Jack has the ability to render a human being into a pillar of salt. Jack was also shown to be able to forge human souls into angels with ease.[22]

Episodes

Castiel senses a massive surge of celestial energy and discovers that a Nephilim has come into being. Sam, Dean, and Castiel realize that the Nephilim is the spawn of Lucifer. After abducting Kelly, they explain that Kelly is carrying Lucifer's child. At first, she doesn't believe them, but after she places her hand on a Bible, it bursts into flames. When Castiel takes Kelly to a diner after they exorcise Lucifer from President Jefferson Rooney, Kelly tricks Castiel into believing that she is going to the bathroom and escapes. She later calls Castiel and tells him that she can't get rid of her baby, stating that she is its mother and it's her child before hanging up.

Crowley tells Lucifer that Sam and Dean have taken care of Kelly's baby, but Lucifer reveals that he is able to sense its heart and power, confirming that it's still alive. Elsewhere, Kelly is confronted by two angels, but she is saved by Dagon, who confirms that Kelly's baby is going to be a boy when it is born. She states that nothing is born evil and tells Kelly that she doesn't have to run anymore and that her child could bring salvation to the world. Kelly agrees to let Dagon protect her and her baby until it is born.

Kelly, after experiencing some pain, demands that Dagon takes her to a doctor. He performs an ultrasound of the baby; he notices something unusual, but Dagon telepathically instructs the doctor to tell her that "everything looks a-okay." After Dean takes Kelly and tries to convince her that she can't have the baby, she tells them that she loves the child and refuses to get rid of it. When Dagon appears to take her away, she willingly goes with her. Later, Dagon chains Kelly to a bed and tells her that she cannot be trusted. Kelly tries to explain that she was worried about the baby, but Dagon bluntly tells Kelly that the baby will be just fine and that birthing a Nephilim is always fatal for the mother.

After spending a few days refusing to eat, drink, or bathe, Dagon forces Kelly to take her pills and tells her that her son will be born and bring an end to all things no matter what happens to her, and that she should take a bath. Kelly, realizing what Dagon said may happen, attempts to kill herself, despite her love for her child. After she dies, the Nephilim revives her. Dagon eventually discovers what happened and tries to explain the baby saving her as an act to save himself and reminds Kelly that she will die when he is born. After this, Kelly is influenced by the powers of the Nephilim and believes that her son is not evil and will bring paradise to the world. After Joshua tracks a disturbance caused when the Nephilim revived Kelly, Castiel, Kelvin, and Hozai are able to track Dagon down. After Hozai is killed and Kelvin is captured, Castiel escapes with Kelly.

After exhausting the information they have on Nephilim, Sam is able to determine that it will be born on May 18. He realizes that since Nephilim are merely human souls infused with angelic grace, removing the grace could render the Nephilim human so that Kelly and her baby wouldn't have to die.

After communicating with Joshua, Castiel tries to bring Kelly to Heaven's Gate at the Playground. Kelly tries to convince Castiel to let her baby be born, believing that it could lift the world to its feet rather than bring it to its knees. She explains how she tried to kill herself and how the baby was able to bring her back, but Castiel explains that her revival was not proof of goodness and he asks who will keep the baby on the righteous path when she is gone. Kelly asks him if he wants to feel the baby kick, but when Castiel puts his hand on her belly, he experiences a vision introduced by the Nephilim.

Sam and Dean are able to catch up to them and explain that they have a plan to render the baby human by removing its grace, but Kelly refuses to let them do it since she wants her baby to be born with all its powers. While waiting in the Impala for Sam and Dean, Kelly takes the keys and drives away from the motel, believing that Castiel will be able to take care of her baby when she is gone.

After arriving at the playground, Joshua is swiftly killed by Dagon. As she is about to kill Castiel, Kelly takes hold of his hand; through this connection the Nephilim transfers its power to Castiel temporarily and allows him to incinerate Dagon, killing her. Castiel, influenced by the Nephilim's power, decides to leave with Kelly to allow her child to be born. When Sam and Dean try to stop them, Cas knocks them out and they drive away in his truck. When Kelly asks what Castiel saw, he tells her the Nephilim showed him the future.

Castiel and Kelly prepare for the Nephilim to be born by renting a house in North Cove, Washington, purchasing a truckload of diapers, and preparing its room. Kelly even gives him a name: Jack. She makes a video for Jack to watch after she dies, telling him how much she loves him. When she feels a contraction, she unknowingly releases a bit of the Nephilim's energy, which makes a rift to an Alternate Universe.

While Sam, Dean, Castiel, and Crowley deal with Lucifer, Kelly finally gives birth to Jack in an explosion of light that renders Mary unconscious. When Sam notices the light coming from the home, he goes to check on Kelly, only to find her lying dead in her bed. Hearing a noise, Sam goes to investigate. He sees footprints scorched into the floor leading to Jack's nursery, where he finds an already adult-looking Jack huddled in the corner, smiling as his eyes glow gold.

"My mother, she said Castiel, he would keep me safe. She said the world was a dangerous place. That's -- that's why I couldn't be a baby or a child. I That's why I had to grow up fast. That's why I chose him to be my father. Where is he?"

Sam tries and talk to Jack, who asks if he is his father. Sam tells Jack he is not his father, and is still attempting to speak with Jack when Dean arrives and immediately takes his gun and shoots at Jack, narrowly missing him. Jack becomes angry and in self defense begins screaming, causing a pulse of energy to emanate from his body that blows out all the windows in the house and freezes Sam and Dean in the air before jettisoning them back into the wall, knocking them unconscious. Jack leaves the house and wanders the woods until he comes across a Pirate Pete's Jolly Treats, and asks at the drive-thru for his father. Seeing that he is naked and confused, an employee, Clark Barker, calls his mother, Sheriff Christine Barker, to deal with the situation. Sheriff Barker arrives to find Jack still standing in the parking lot. Seeing the sheriff's gun, Jack initially takes a defensive stance until Sheriff Barker assures him she only wants to help him.

At the Sheriff's Department, a now fully clothed Jack begins absorbing his new surroundings while Sheriff Barker tries to get information out of him. Jack is only able to tell her that his mother is in Heaven and that he is looking for his father. Jack is then fingerprinted, and sits with Clark who asks what Jack is on. Jack tells him he isn't stoned, but that he is hungry. Clark takes Jack to the break room, where Jack tests out a new power that allows him to get free food from the vending machines; he becomes a big fan of nougat. Sheriff Barker, while receiving a call from Sam, looks at Jack’s fingerprint which displays vertical lines rather than whorls. Soon after showing this ability to Sheriff Barker, Jack begins picking up angel radio, which causes him great discomfort. When Sheriff Barker tries to stop him from leaving, Jack loses control and sends her flying into the vending machines. As he tries to leave the station, he comes face to face with Dean, but before Jack can do anything Sam hits him with a stun gun, rendering Jack unconscious.

Sam and Jack are placed in a holding cell, while Dean explains the situation to the sheriff. When Jack comes to, Sam apologizes to Jack and explains he didn't want to hurt him. Jack tells Sam he was scared of the voices he was hearing, which caused him to lose control. Jack tells Sam that he doesn't know if he can open another rift, and that he needs to find his father, who will protect him. When Sam tells him Lucifer doesn't do that, Jack corrects him and tells him that Castiel is his father, because his mother told him that Castiel would keep him safe. He also explains that through his mother, he knew the world was dangerous and chose to mature into young adulthood immediately after his birth to protect himself. When he asks Sam where Castiel is, he sadly replies that he's dead, which shocks Jack.

A trio of angels lead by Miriam arrive at the station; two of the angels are able to locate Jack in the holding cell area. When they try to take him, a fight ensues, ending with Sam banishing them. The action of the sigil causes Jack momentary discomfort. Miriam enters the holding cell area, but is flanked by Sam and Dean. Feigning that she is giving up, she tells Sam that if the angels can't have him, no one will and drives her angel blade into Jack's heart. After Sam kills her in retaliation, Jack drops to his knees and pulls the blade from his chest. To Sam and Dean's shock, he is fine.

In the aftermath, Sam and Dean decide to take Jack with them back to the Men of Letters Bunker, but before going home, the trio go and give Castiel and Kelly a funeral pyre.

"Yes. I understand. Pain is a part of the complete human experience. Accepting it is a sign of maturity."

After Sam is able to talk Dean into taking a break, the three stop at a motel. While Sam and Dean ward the room and get food, Dean suggests Jack do some reading, tossing him a copy of the Bible. While eating their meal, Jack begins to mimic Dean, much to Dean's annoyance. Jack goes on to question Sam and Dean about Lucifer, whom he read about in the Bible. Sam soon shifts the subject and begins questioning Jack about his powers, asking if he can teleport. When Dean asks him how Jack would get from the couch to the other side of the motel door, Jack simply stands up and walks out the door then knocks on it before re-entering with a smile. Soon the prophetDonatello Redfield arrives, telling Sam and Dean he followed an intense power signal to their location and thought God may be with the Winchesters. Donatello is introduced to Jack, and he tells the Winchesters the energy radiating off of Jack is nothing like the dark and toxic energy of Lucifer's. Sam and Dean conclude that if Donatello could find Jack then others will be able to, so they take Jack to have protective symbols tattooed. Jack has a violent reaction to the tattoo needle touching his skin, but after being told to suck it up by Dean, Jack is able to get the protective tattoos without further incident. Unfortunately they disappear as soon as they are completed due to his healing powers. While leaving the tattoo parlor, they are spotted by a demon who relays their location to Asmodeus.

Back in the motel room, Sam, Dean, and Donatello quarrel over Jack’s actions, with Dean's anger causing Jack to get upset and accidentally teleport himself outside to escape the conflict. Sam eventually finds Jack sitting in an alley and comforts him by explaining that Dean’s aggressive behavior is the way his fear manifests itself, and that Dean is just looking to protect Jack, as well as other people from Jack due to his powers. Sam tells Jack that just like Kelly and Castiel did, he has faith in him.

The next morning, Sam is alone in the room going over lore on Nephilim when Donatello enters to talk about Jack. Donatello asks Sam if he has any idea how strong Jack will be and Sam confides in him that the lore suggests that a Nephilim will become more powerful than the angel that sired them. When Dean comes back to their room, Sam tries to explain why he should give Jack a chance but they are interrupted by Donatello entering to discuss Jack, causing them to realize that the previous Donatello was a fake. Upon further investigation, they realize that Jack is missing and are ambushed by two demons. Meanwhile, the fake Donatello has taken Jack to a field in Jasper, Wyoming, and is using Jack’s powers to open a Hell Gate to release the shedim by telling him that they are a force for good that need to be saved.

Sam, Dean, and the real Donatello read John's journal on their way to find Jack and realize where he has been taken. They reach him in time to see the shedim beginning to emerge. Dean shoots the fake Donatello, causing him to morph back into Asmodeus who uses his demonic powers to choke Sam, Dean, and Donatello. Despite trying to persuade Jack to join him, the fact he is hurting Jack’s "friends" brings out his anger, forcing Asmodeus to flee.

Finally home, Sam and Dean sit in the Bunker's kitchen discussing Asmodeus and the fact Jack saved them. Dean leaves but on the way to his room hears a strange noise and discovers Jack repeatedly stabbing himself in the chest with a large knife. Dean’s mask of indifference slips slightly and he snatches the knife from Jack while chastising him for being an idiot. Jack asks Dean what he is and says that he is afraid that he will hurt someone. Dean explains that Sam believes Jack can be saved, whereas Dean does not and that when the time comes, it will be Dean who kills him.

"And maybe he should. Mom said I could be good, that I had the choice to be good, that it was up to me. But she’s dead, because of me. I’ve only been on earth for a few days and I’ve already hurt people. I’ve already done bad things, and no matter how hard I try I can’t… I can’t do the one good, stupid thing you want me to. So I must be evil, like Lucifer."

At the Bunker, Sam gives Jack a thumb drive left for him by his mother and explains that perhaps what he will see will help him to answer some of his questions. Jack presses play on the video his mother made for him before her death and his birth. As Sam leaves Jack's room he receives a call from Missouri Moseley asking for help. Sam tells Dean about the call and that he has asked Jody Mills to investigate. Dean becomes angry and says he has no intention of putting Jody at risk to stay and look after Jack.

With Dean off to help Missouri, Sam tries to train Jack to control his powers. Telling Jack that he needs to learn to focus, he gives Jack the simple task of moving a pencil with his mind, but Jack isn’t able to move it. Seeing Jack's frustration, Sam decides that they should take a break. As Sam goes to get some food for them both, Jack continues to try desperately to move the pencil.

After many attempts, Jack becomes upset and slips away. Realizing Jack has disappeared, Sam in a panic goes to look for Jack and finds him sitting in a corner. Jack tells Sam that he believes he must be evil because Dean thinks he is evil, since he can't even do a simple good thing by moving the pencil. Sam tells Jack he knows what it feels like to not fit in and have a darkness inside. He crouches in front of Jack and pulls him to his feet, kindly saying that his family -- Dean and Cas -- helped him through his troubles and now he wants to help Jack. They decide to forgo the training for the time being.

When Dean returns from the hunt he was on with Jody, Sam confronts him about his behavior towards Jack. Sam tries to draw a comparison between him drinking demon blood and Jack, telling Dean that Jack deserves to be saved now just as much as he did then. Dean becomes angry and calls Jack a freak that he could hardly look at, which Jack overhears. Sam and Dean continue arguing about the losses that came from Jack's birth, with Dean directly blaming Jack for Castiel’s death. As Jack listens he repeats Castiel’s name and his eyes glow gold.

Castiel is lying face down in the ominous, black void of the Empty. Upon hearing Jack say his name, he awakens and slowly sits up, looking around himself in puzzlement.

"Sam thinks you were right, that—that I’m good. He wants me to believe it, and I wanna believe it, too. It’s just, I… I’ve hurt people. I didn’t mean to. It was an accident. And I know I should feel bad, and I say I feel bad, but most of the time, I mostly… I don’t feel anything. And that’s why I think maybe… Maybe I’m a monster."

Sitting in his room, watching Star Wars: The Clone Wars, Jack is approached by Sam to come with him and Dean on a hunt. Jack declines, revealing he knows Sam is using him to be his “interdimensional can opener.” Sam admits this and apologizes to Jack, telling him about the rift to Apocalypse World and how Mary got trapped on the other side. He says he hopes that Jack could reopen it and bring her back, but if he can't it's okay. Jack shifts the conversation to Dean, telling Sam that Dean wants to kill him. Sam assures Jack that he won't let Dean hurt him, and that the best thing for him to do to get on Dean's good side to put in the effort and come on the hunt. Jack relents and agrees to come along.

Arriving at the Bailey house in Madison, Wisconsin, Jack is told by Dean to stay in the Impala while he and Sam interview a neighbor. Jack, however, soon leaves the car and enters the Bailey house to investigate the spot of the murder, telling Sam and Dean he is trying to help. Sam uses the EMF meter, and explains how the meter works to Jack. When the meter shows no traces of ghost activity, the trio head to the cemetery to see if they are dealing with a ghoul.

Arriving at Erica Bailey's grave, Dean has Jack dig up her body. Upon unearthing the casket, they find Erica's body undisturbed. Thinking they may still be dealing with a ghost, Dean salts and burns the corpse. Jack questions if his mother may have become a ghost; Sam tells him that they burned her body and that what gets burned, stays dead.

The next day, Sam and Dean discover all the recent victims were patients of Mia Vallens, a grief counselor. Going to her practice, the three pose as brothers seeking Mia's help in dealing with the loss of their "mother." When Sam discovers Mia is a shapeshifter, she is able to convince them she hasn't killed anyone and realizes her former partner, Buddy, is the probable suspect. Believing Mia's assistant, Tom, could be Buddy, Dean and Jack go to check out if he's the shifter while Sam combs through surveillance footage where he finds Buddy posing a patient. Dean and Jack return to Mia's after Sam has left to check out this lead. While Dean calls his brother, Jack asks Mia to talk alone. In her office, Jack shows Mia the video Kelly made for him and asks if she could take her form so he could see his mother in person. Mia agrees and tells Jack to close his eyes while she changes. When he opens his eyes, Jack begins crying and calls out "Mom" to Mia and hugs her. He tells Mia how he thinks he may be a monster, but Mia tells him it doesn't matter what he is, only what he does and that even monsters can do good in the world. After Mia changes back, Jack thanks her as Buddy, appearing as Dean, barges into the room, picks up a fire poker, and knocks Jack unconscious. Restraining both Jack and Dean, Buddy orders Mia to kill them both or die. When Mia refuses to kill them, Buddy is about to shoot her when Sam arrives. Shifting focus, Buddy mimics Dean's voice and calls Sam into the room. When Buddy takes a shot at Sam, Jack's powers manifest, deflecting the bullet before it hits Sam, and hitting Buddy with a blast of celestial energy, allowing Sam time to kill him.

Back at the Bunker, Dean approaches Jack and tells him he did good, leaving Jack with a smile on his face.

"No, you don't… Every time I try and do something good, people get hurt. I thought I was getting better. I'm not… I don't know what I am, but I know I can't make the world a better place, not like this. I can't even do one good thing. And I know that if I stay, I'm gonna hurt you. All of you. And… I can't. You're all I have."

Sitting at a computer as Sam and Dean return to the Bunker, Jack asks Sam how things went. As Sam pauses to answer, Castiel walks into the room and meets Jack for the first time. Shocked that Castiel is alive, believing burning his body meant he would remain dead, Jack is asked if he brought Castiel back. Jack is unsure, only able to tell them that he wanted and begged for Castiel to come back. Castiel thanks Jack, who tells Castiel how he missed him as the two embrace. After telling him he is doing well, an excited Jack demonstrates his telekinetic abilities by making a pencil float in the air with ease, before revealing to the three that he also found a case involving a grave robbing that may be about a zombie. When asked where he learned to seek out cases, Jack tells Dean that he learned it from watching him and Sam and goes on to relate the facts of the case to them, surmising that the dead are rising in Dodge City, Kansas. With the prospect of going to Dodge City enough for Dean, the four head out on the case.

Arriving at the motel, an excited Dean is in awe of the Western memorabilia. As Sam and Dean go and put their bags in their room, Jack offers Castiel the couch, telling him he doesn't sleep much, only for Castiel to tell him he doesn't sleep at all. As the night wears on, Jack and Castiel sit at a table and talk, with Jack telling Castiel about everything that has happened since his birth, as well as questioning him about Heaven and whether his mother is there. Castiel tells Jack that Kelly was a brave woman and apologizes to him for not being there for him when he was born. Jack says he understands why his mother trusted him and why he did as well, telling him he felt safe around Castiel in his mother's womb. As Castiel tells Jack that Kelly believed he would do great things for the world and how proud she would be, an alert on the computer goes off, indicating a murder. Jack in his excitement goes to wake up Dean; Castiel tries to warn him, but is too late as Jack is able to jostle Dean awake, who pulls his gun from under his pillow and trains it on Jack. Realizing what is going on, he puts the gun away and asks who is making his coffee. With Sam and Dean awake, Jack tells them how the victim had bite marks, believing that it could be a zombie, which Dean dismisses as proof of anything with teeth.

Later that morning, Jack joins with Sam as they investigate the cemetery where the grave robbing happened. Sam and Jack enter the basement of the mortuary, startling the undertaker Athena Lopez. Introducing themselves as FBI, Sam questions Athena while Jack looks around, chiming in with questions about cold spots and flickering lights. As Sam and Jack go to check out the robbed grave, Jack uses an EMF meter in the graveyard causing it to react, but Sam tells him not worry about it. Getting to the grave, Sam soon realizes that they are dealing with a ghoul and meet back up with Dean and Castiel to relay the news.

While looking at traffic camera footage of the stolen truck from that morning's crime scene, Dean recognizes the man as famed Western outlaw Dave Mather and Jack is able to also identify him as Athena's boyfriend, having seen a picture of him with her at the mortuary. The four drive to Athena's where Sam and Dean learn Dave has gone to the bank. They race to the bank, arriving just as Dave has robbed it and is preparing to flee. When a gun fight breaks out, Jack attempts to help. He takes two shots to the chest from Dave, which does not deter him. With a smile, Jack continues forward, sticking his arm out and releasing a blast of energy that sends Dave flying back, while also inadvertently knocking a nearby security guard into a pillar, fracturing his skull. Realizing what has happened, Jack, Castiel, and Sam race to the security guard. Castiel attempts to heal him, but he is unable to before the guard dies. In the aftermath, Dean suggests that Sam and Cas take Jack back to the Bunker while he deals with the ghoul. On the drive back to Lebanon, Castiel attempts to assure Jack that the security guard's death was a mistake. He relates that he has killed innocent people in the past, but that it doesn't mean Jack should stop fighting or trying to be better. Sam attempts to tell him they still believe in him. Jack, distraught, tells Sam to just "stop."

Dean returns and reveals he killed Dave and smoothed things over regarding Jack and the security guard. An angry Jack interjects, asking if the guard had a family. When Sam tries to calm him, Jack begins to question if he really is a monster. Dean tells him they've all done bad things, so if Jack is a monster so is everyone else. Jack retorts that every time he has tried to do something good, people have gotten hurt. Believing he can't make the world a better place the way he is now, and not wanting to risk hurting Sam, Dean, or Castiel, Jack decides to go off on his own. He raises his hand and apologizes before he sends out an immense shock wave, knocking Sam, Dean, and Castiel down and blowing the lights in the room before teleporting away.

"I left to try to get a grip on my powers. I wanted to prove to you that I'm good, to do one good thing. So I did the thing you wanted the most. I experimented opening doors to other worlds. I could almost do it. I could get right to the edge. But I couldn't see. I could only feel around in the dark. I needed eyes. A seer."

Jack pays a visit to artist Derek Swan in Bismark, North Dakota, under the pretense of purchasing art. Jack quickly reveals his true intent, telling Derek he knows he is a dreamwalker and wants his help. Derek initially refuses until Jack offers to pay him. As Derek prepares to visit Apocalypse World for Jack, he begins losing his connection until Jack channels some of his energy into Derek, allowing him to see Apocalypse World as well. The strain starts to become too much for Derek, who screams in pain, causing Jack to stop. Realizing he isn't strong enough to help Jack, Derek gives him the name of Kaia Nieves, a powerful dreamwalker who may be able to help him.

At a rehab facility, Jack introduces himself to Kaia, who is immediately able to tell Jack is lying about his cocaine addiction and attempts to leave. Jack tells Kaia about Derek and how he directed him to her, and asks for her help, telling her he can get her out of the facility. Kaia agrees and Jack leads her out, rendering a counselor unconscious with a touch, to Kaia's shock. Making it outside, Kaia attempts to leave; when Jack attempts to stop her, she fights back. As Sam and Dean arrive on the scene, Jack is distracted which allows Kaia to kick him to the ground. She then proceeds to punch him on the jaw and run away, leaving Jack baffled. Sam and Dean begin questioning Jack about Derek Swan's death; Jack explains how he needed a dreamwalker to guide him to alternate universes. He goes on to reveal that Mary is alive, showing Sam and Dean a vision of what he saw while dreamwalking with Derek.

As the three begin their search for Kaia, Jack is hit with angel radio and tells Sam and Dean that Kaia has been caught by angels. They locate Kaia and the angels at a warehouse, where Jack fights off the angels, sending the female angel across the room and saving Dean by forcing the male angel to stab himself with his angel blade. With Kaia freed, Jack tells her that they will protect her, and that he was planning to take Kaia to the Wind Caves, a place where the walls between worlds is thinnest. Kaia once again refuses, until Dean forces her at gun point. In the backseat of the Impala, Jack apologizes to Kaia for everything that has happened, but explains that their powers can do good in the world, and shows her the Multiverse. The female angel suddenly appears and attempts to run the Impala off the road. Dean takes the group to an abandoned shipyard where the Winchesters, Jack, and Kaia take refuge from the angels in an old ship, painting warding sigils to keep them at bay. Realizing they are trapped, Kaia offers to help Jack get to Apocalypse World as the angels begin to break the warding. As Kaia begins dreamwalking, Jack places his hands on her head. As he helps guide her to Apocalypse World, Kaia begins losing her hold and slipping back to the Bad Place. As she and Jack struggle to hold their connection, a blast of energy explodes from Kaia and Jack, killing the angels while opening a rift that sends Sam and Dean to the Bad Place as Jack is sent to Apocalypse World, waking at the feet of Mary in Michael's Fortress.

"I had to come back. Sam and Dean, they wouldn't run. They'd stay and fight. These angels, what they're doing, they're not gonna stop. As long as Michael's out there, this war will never be over."

At the Bunker, Jack is happy to hear the voices of Sam and Dean. He leaves his room to find Sam and Dean trapped in another room with smoke billowing out of the door. He attempts to use his powers to break the door down, but is unable to save them and is sent to the floor by his powers. Jack is then seen standing in a room in Michael's Fortress, his eyes vacant as he looks into the distance. Michael appears behind him while Zachariah is holding his fingers to Jack’s head, manipulating his mind to get Jack to open a rift. Zachariah switches tactics, changing the location of Jack's hallucination to North Cove, Washington, where he was born. He uses Castiel's form to try and manipulate him, but Jack is able to see past Zachariah's manipulation and break free. Jack finds himself in Apocalypse World standing before Michael, who throws Jack into a wall, knocking him out. Michael then flings Zachariah away for failing him and decides to persuade Jack to comply in his own way.

Michael drags Jack down a hallway before dumping his unconscious body into a cell with Mary Winchester. Mary tells Jack she has seen him before. Jack tells her Sam and Dean sent him to save her. He attempts to use his powers to break them free, but the heavy warding is preventing him from using his powers. Mary is able to find a weak spot in the warding, allowing Jack to burn through the prison cell's bars.

Jack and Mary begin traversing the wasteland at night, when they come across Bobby Singer and some of his men patrolling. Recognizing Mary, and realizing she is Sam and Dean's mother, he takes them to back to his camp. Going through the camp of injured people, Jack asks what happened to them, and Bobby explains that angels have been exterminating humans. Later that night, Jack is making shadow puppets for the children of the camp, who are laughing, while Mary and Bobby converse. When Bobby learns Jack is a Nephilim, he demands that he leave the camp in the morning. He explains that the humans once believed that the angels were on their side when Lucifer and his demon army rose from Hell, but they turned on humanity and Bobby believes that Jack will turn against them in a matter of time.

When morning comes, Mary explains to Jack that they need to leave, and Jack immediately asks if it is because of him. As Mary apologizes, a siren begins to blare throughout the camp. When Mary and Jack look up, they see an angel dive-bombing into the camp, exploding near them. As they lay on the ground in the aftermath, Zachariah and two angels emerge and Jack and Mary flee. Bobby explained that the angels found out where they are since Jack used his powers. He tells Mary to help evacuate the children of the camp, while angrily telling Jack he has done enough. When Jack offers to help Mary, she tells him they can't afford the angels getting him, and tells him to hide.

As Jack runs through the woods, he begins hearing people screaming. He turns around to find Zachariah about to kill Mary. He tells him to stop, but when Zachariah ignores him. Jack lifts his hand as a blast of his power hits Zachariah. Bobby arrives as Jack raises Zachariah off the ground and disintegrates him. When Bobby warns them of more angels incoming, Jack looks to the sky. Raising his hand, he causes the angels to explode before they reach the camp. In the aftermath, Mary and Bobby both thank Jack, who explains he came back because it is what Sam and Dean would have done. He tell Mary and Bobby he realized that the angels are not going to stop killing humans, that the war will never end as long as Michael is still out there, and declares his intent to kill Michael.

As Jack describes his recent victory over Balthazar's soldiers to Mary, they are surprised by the sudden arrival of Jakob, who brings the news that Michael and his forces have abandoned his fortress. Jack uses his powers to confirm Jakob's news, astral projecting to the fortress and seeing that, but for a few angels guarding the perimeter, the fortress stands empty. Jack suggests they go to the fortress to see if Michael left any clues as to what his plans might be. While Mary shows trepidation, believing it could be a trap, Jack assures her that he will keep her and everyone else safe.

Arriving at the fortress, Jack is examining a map of the United States with Michael's soldiers all gathered in the south when Jakob enters, having found Kevin Tran locked up in the dungeon. As Kevin begs for his life he reveals Michael's plan: using a modified spell from the angel tablet to open another rift in the south, at a place where the walls between worlds are thin.

As the group debates whether or not Kevin's information is a trap, Jack asserts that he can surprise Michael and kill him. Mary attempts to dissuade Jack from leaving, telling him Bobby is only a day away from arriving, and they should wait for him. She pleads for Jack to give her one day. Jack initially agrees to stay but changes his mind, telling Mary he has to kill Michael. She once more tries to stop Jack, telling him he can't go in blind all the time and expect to not make mistakes, and that she can't lose another boy. Jack, however, promises to Mary that he'll come back for everyone. Suddenly, they are interrupted by Kevin, who reveals he was placed in the dungeon by Michael as a trap to break him. He gives Jack a message from Michael, telling him "Even if you win, you still lose," before activating a sigil carved in his chest, filling the church with a blinding light as Jack uses his wings to protect himself and Mary.

Afterwards, the burned bodies of Kevin, Jakob, and his men lay strewn all over the church. Jack blames himself for all their deaths, telling Mary he promised to protect them and failed. Mary attempts to comfort Jack, who simply asks her, "If I can't keep them safe, then what's the point?"

Jack paces behind a log, talking with Castiel, muttering to himself that Sam can't be dead. Castiel puts his hand on Jack’s shoulder but Jack shoves it away. Before Castiel can attempt to console him, Jack demands to know why Castiel didn't bring him back. He moves to Gabriel to ask the same question; Gabriel responds he is too weak, and Castiel explains that they couldn't save him.

As Dean is preparing to collect Sam's body, sirens blare in the camp and a bloodied Sam walks in. Jack's anger turns into joy, before Lucifer enters behind Sam and greets his son for the first time.

Lucifer's sudden arrival causes tension throughout the camp. As Lucifer attempts to speak with his son, he is stopped by Dean who orders Gabriel to kill Lucifer. As the arguing intensifies, Jack grows agitated and teleports away to think about the situation. Remembering what his mother told him, that it is his choice to be who he wants to be, Jack returns to the camp, telling Castiel that he wants to listen what Lucifer has to say, and form his own opinions.

He first questions Lucifer why everyone hates him. Taken slightly aback, Lucifer explains to Jack his views on humanity and how limited and corruptible they are. When Jack tells him his mother was human, Lucifer back-pedals. He says that the world needed a fall guy for all the evil that occurs, but that as he was locked away in a Cage, he couldn't have done all the things he is blamed for. As they continue their conversation, Jack questions Lucifer about God, but before Lucifer can answer, Dean puts a stop to their talk. As Sam and Cas try to dissuade him, he tells them he will never know anything about his father unless he talks to him.

As the camp makes the journey to Bobby's home, Jack tells Sam that he believes that with Lucifer on their side, they are strong enough to defeat Michael. He pleads with Sam to let him take a shot, but Sam refuses to go against their set plan of escaping Apocalypse World with the refugees.

When they arrive at Singer Salvage, Jack and Lucifer take a stroll where Lucifer tells Jack of his family, and introduces Jack to his uncle, Gabriel. Gabriel gives a curt greeting to his nephew, before telling Lucifer to stop playing the victim before he departs. Later, learning about the capture of Charlie and Ketch by the angels, Jack joins the Winchesters on the rescue mission where he uses his powers to kill the angels guarding the abandoned Gas-N-Sip.

When Bobby and the others at his camp agree to join the Winchesters in their escape from Apocalypse World, Jack attempts to stay behind to fulfill the promise he made to himself to kill Michael. Sam tries to discourage Jack from his plan, and with the help of Lucifer is able to talk Jack into leaving with the rest of the group. When they arrive at the portal, Jack is one of the first people through.

With everyone safe and celebrating in the Men of Letters Bunker, Jack sits alone, mourning the apparent death of his father.

In the aftermath of escaping Apocalypse World, Jack joins Sam, Dean, and Castiel on a werewolf hunt. As Cas takes care of a werewolf taking a smoke break, Sam, Dean, and Jack bust through the door of the boathouse. The men’s fangs descend as they jump up out of their seats. Jack puts out his hand and holds them back as Sam and Dean shoot the men several times with silver bullets.

Back at the Bunker, Dean notices Jack having a nightmare in his room. Dean attempts to comfort Jack, telling him he has nightmares of the people he couldn't save, too. He reassures Jack, telling him that nobody is perfect and that all anyone can do is try to better themselves. Sam soon comes into the room with news from Mary and Bobby and the three meet up where the body of Maggie was found.

Believing it is his fault that Maggie died due to his promise to protect her, Jack teleports away to a gas station where a boy Maggie was seeing works, believing him to be to culprit. Sam, Dean, and Cas arrive soon after to find Jack choking the young man. When he refuses to let him go, Dean fires a few shots into Jack's back, shocking him into letting go. When Sam assures him the boy didn't kill Maggie, Jack apologizes as he begins to walk away. Castiel attempts to follow but is stopped by Dean.

Walking down a wooded area, Jack begins hitting himself in frustration for all the people he couldn't save when he is met by his father, Lucifer. Jack is surprised to see his father alive. Lucifer tells him that Sam lied about his death, but tells him not to hold a grudge considering what he has done to Sam in the past. The two begin talking, and Lucifer tells him that no matter how many times they help people, something always goes wrong, and it's neither his fault nor theirs. When he suggests they go off and see the universe together, Jack is excited by the prospect, having become a fan of Star Wars in his short time on Earth. But before they depart he has Lucifer promise to do something for him, and the two teleport to the Bunker, where they are met by Mary and Bobby. Jack tells Mary they are there to help and asks Lucifer to resurrect Maggie; a hesitant Lucifer obliges Jack, and the two teleport away after Maggie is brought back to life.

Later that night, Jack and Lucifer are watching the stars as they ready to depart the Earth, when Jack begins to hear a prayer from Sam, begging for help. He quickly teleports to the Bunker where he finds Michael attempting to strangle Dean to death, and uses his powers to cause great damage to Michael's vessel. When the pain causes Michael to reveal his partnership with Lucifer, Sam also reveals that it was Lucifer who killed Maggie. As Lucifer denies the allegations, Jack uses his powers to compel Lucifer to tell the truth, at which point he gleefully describes how he murdered Maggie in detail. Learning this, Jack rejects his father, calling him a monster, which greatly angers Lucifer. Realizing he has lost his son, Lucifer tells him he only needs his power, and slices Jack's neck and consumes most of his grace. As he begins to teleport away with Jack, Sam grabs on to him and is taken along to a church.

In the church, Lucifer begins to kill Sam, but Jack tries to stop him, prompting Lucifer to punch him repeatedly. He then coldly tells Jack that he lost his chance of being his son and can always make more kids. Lucifer offers the duo an ultimatum: He will allow Jack or Sam to walk out of the church, and give them a week to stop him, if they fight to the death now. He tosses the archangel blade on the ground between them, and when Sam picks it up and tells Jack to kill him, Jack refuses, telling Sam he won't be able to stop Lucifer, but he believes that Sam will. Telling Sam he loves him and all of them, Jack takes the archangel blade and begins to slowly push it into his chest. Before he can complete the task, Dean arrives, having given consent to Michael to possess him. He and Lucifer engage in battle in the church as Sam and Jack look on. When Lucifer gains the upper hand, Sam throws Dean the archangel blade, allowing him to stab Lucifer in the heart and finally kill him. Sam, Dean, and Jack celebrate their victory, but the celebration is cut short. Jack can only look on helplessly with Sam as Michael reneges on his deal with Dean and takes control of his body before teleporting away, leaving them in the church with Lucifer's corpse and wings burned onto the ground.

"She would sing and talk to him even before he was born. She made him feel... safe and... wanted. I heard her tell him that it isn't fate or her or his dad who sets his path. It's himself. Who he chooses to be."

"Michael’s my enemy too. I fought him for months. And Kaia-- I’m the one who brought her into this. I’m responsible for what happened to her. I wanna help"

Jack becomes frustrated with his slowly-recharging grace and the way that everyone else is treating him. Jack prepares to leave the Bunker to set out on his own, but notices Castiel and a hunter named Jules attempting to save a young woman named Lora who is suffering from a witch's curse. Jack decides to stay and help instead of leaving and does his best to comfort Lora, who tells him about her experiences with the witch. After Lora dies, Jack is devastated by his inability to save her in his powerless state. However, Jack is able to put together clues from Lora's story about the witch to realize that it was the witch's necklace that was cursed and draining Lora's life force. By smashing the necklace, Jack restores Lora's life force and resurrects her, saving Lora's life.

Afterwards, Castiel congratulates Jack on his actions, telling Jack that by saving Lora the way that he did, Jack has proven that he has the heart and mind of a hunter. Castiel suggests that they begin going on some hunts together, which Jack is pleased by. He plays down an illness he has developed. Once Castiel is gone, Jack is revealed to be coughing up blood, something that clearly worries him.

"I've seen romantic movies, but I've never experienced it, unless what you said about Rowena and Gabriel counts. "

With Sam on a hunt with Charlie Bradbury, Jack brings Dean a possible case that he has found and suggests that they take it together. Jack recognizes that they both feel guilt for their role in Michael's actions and suggests that by working the case they can distract themselves from it, which Dean reluctantly agrees to.

During the hunt, Dean uses Jack to get close to Harper Sayles using a ploy the two set up, though Jack proves to be extremely naïve about how romance works. After the culprit is revealed to be a zombie named Vance, Jack realizes that Vance is Harper's ex-boyfriend. Harper reveals herself to be the necromancer that resurrected Vance as a zombie and sends him after Jack. Jack pretends to have genuinely fallen in love with Harper to distract her and together Jack and Dean restrain Vance with silver handcuffs. The two are then able to kill Vance by staking him to his coffin, but Harper escapes and develops an obsession with Jack.

In the aftermath of the hunt, Dean congratulates Jack on his good work and agrees that Jack can begin hunting with them again. Having continued to display his strange cough while working with Dean, Jack coughs up blood in front of a worried Dean before suddenly passing out, bleeding from the nose and mouth.

"What I do know is I'm done being special. Before my life is over, I wanna live it. I-I just want a chance to... get a tan... to see a hockey game... get a parking ticket... get bored... and when it's all over... die."

With Jack's condition worsening and Castiel unable to heal him, the Winchesters and Castiel quickly rush Jack to a hospital where he undergoes a battery of tests. The doctors are unable to determine exactly what is wrong with him, but learn that he's going into systemic organ failure.

With the doctors unable to help, the three check Jack out of the hospital and bring him back to the Bunker where they call upon Rowena for help. After learning that Jack is Lucifer's son, Rowena initially refuses until Jack appears personally to try to convince her. After Jack practically collapses in front of her, Rowena agrees to help and runs a diagnostic spell on Jack. From the spell's results, Rowena determines that without his grace to maintain a balance, Jack's human and angel halves are attacking each other. As a result, Jack is dying and his only hope is to get archangel grace to replenish Jack's depleted grace.

While Sam and Castiel work on finding a cure for Jack, Jack himself expresses a desire to live the remainder of his life to the fullest, something that Dean decides to help him with. After going out for food, Dean gives Jack the keys to the Impala and teaches Jack how to drive. Once Jack gets the hang of it, Dean and Jack enjoy simply cruising together. Instead of doing something extravagant next, Jack decides to go fishing with Dean, an activity that Jack knew was the one thing that Dean had enjoyed doing with his own father.

While Dean and Jack are away, Castiel manages to get some of Gabriel's grace and a spell from the shamanSergei to use the grace to recharge Jack's own and save his life. Jack and Rowena perform the spell and he momentarily appears to get better, but then collapses again. Sergei admits that the spell was just an experiment while Rowena determines that there is nothing more that can be done for Jack except to be there for him as he dies.

"He and - and Sam and Dean... they tried their best. But things didn't go as planned. That's why I had to see if you were okay."

A weak Jack tries to comfort Sam, Dean, and Castiel as his end nears, but Dean is unable to stand seeing Jack in such a state and leaves the room. Jack asks Sam to relay a message to Dean for him and dies moments before Dean and Castiel reenter the room. Grief-stricken, the three decide to give Jack a hunter's funeral pyre the next morning and spend the night drinking and sharing stories, essentially holding a wake for Jack.

Jack ends up in a Heaven where he re-experiences the road trip to Dodge City. However, Jack notices the sun and Dean flickering and leaves his Heaven, where he is attacked by a dark force. Jack manages to escape and locates his mother's Heaven. Jack is reunited with Kelly and the two begin to catch up when Jack notices someone approaching the house. To Jack's surprise, its Castiel, who offers Jack a way to bring him back that would require Jack to sacrifice a piece of his soul. As Castiel explains the threat from the Cosmic Entity, it arrives, possessing Dumah, and attempts to drag Jack to the Empty due to his half-angel nature. With the others ready to perform the spell, Castiel offers a deal to trade himself for Jack which the entity accepts, though it decides to wait until Castiel is truly happy to collect.

After the entity departs, Jack reluctantly agrees to keep Castiel's actions a secret from the Winchesters and expresses sorrow that he hasn't had the chance to get to know his mother better. Kelly assures her son that they will get that chance in the future and hugs him goodbye. Castiel resurrects Jack, who awakens in the Bunker still suffering from the condition that killed him. On Sam's urging, Jack quickly completes the spell, causing his eyes to glow as part of his soul is burned away and he is cured.

Later, Jack joins the Winchesters in celebrating over burgers and beer, displaying no noticeable differences in his personality despite losing a small piece of his soul. With Jack saved, and armed with the location of Michael, they express new determination in their mission and share a toast.

Jack is sitting alone in the Bunker kitchen eating a bowl of cereal when Castiel finds him. He questions Castiel about his deal with the Cosmic Entity and asks why Sam and Dean can't know. Cas replies that they don't need the burden and that the life he leads is rarely happy anyway.

After learning that Ketch dropped the Hyperbolic Pulse Generator in the mail, Sam and Jack head to Joplin, Missouri, to steal it from the postal hub facility while Dean and Cas go to Omaha and attempt to retrieve Kaia's Spear for their fight against Michael. In Joplin, Jack shows off his new skills to Sam, having taught himself how to pick locks. After getting the package, Jack and Sam are attacked by Michael's monsters, who drag Jack into a van and drive off.

At Hitomi Plaza in Kansas City, Jack sits with Michael, who explains their connection as powerful celestial beings.

"Well, if it doesn't, maybe there's something I can do. The magic that's keeping me alive, what if I can do more?"

After escaping Hitomi Plaza with the aide of Death, Jack and Castiel lock down the Bunker while Sam figures out what to do with Michael.

After Michael has been restrained in the Bunker's map room, Jack and Michael converse, and Michael attempts to put doubt in Jack's mind about how strong Dean is and whether Dean was relieved when he died. He manages to tell Jack he is a burden and a job Dean never wanted before the two are interrupted by Castiel, who tells Jack to go help Sam.

As Sam works on the British Men of Letters machine that will allow him to enter Dean's mind, Jack asks him if it will work and offers to use some of the magic that is keeping him alive to help. Sam tells him Dean wouldn't want Jack to burn away his soul trying to save him. As Sam and Castiel begin hooking the machine up to Michael, Jack asks what he can do. Sam and Cas tell him to pray for them, and to make sure nothing gets into the Bunker and kills them.

Jack is watching over Sam, Michael, and Castiel as Maggie and the hunters come down the stairs with the warning that the monsters are right behind them. When the monsters are able to get into the Bunker, due to a hunter, Tiger, having been replaced with a shapeshifter, a fight ensues between the monsters and hunters. As the monsters gain the upper hand in the fight, Jack taps into his soul and uses Enochian magic to vaporize all the monsters in the Bunker.

In the aftermath, Castiel admonishes Jack for using the magic and burning off a piece of his soul. Jack tells him it was an accident, and that the monsters would have killed them. Castiel tells Jack he is not mad at him, only worried about Jack losing who he is by burning away his soul. Jack promises he won't do it again.

"What's the point of being a cosmic being if everyone I care about is just gonna leave?"

Jack joins the Winchesters, Castiel, and Rowena in hunting Noah Ophis, a gorgon that has consumed numerous victims and is always one step ahead of them, even with Rowena's magical help. While hunting, Jack displays signs of his illness recurring and covers it up, but later coughs up blood again in the bathroom. Jack is forced to use the Enochian magic once again to heal himself and hides what happened from Dean and Castiel.

Once it's realized that Noah can't see Castiel or Jack, the decision is made to send the two in alone to fight the gorgon. In preparation, Rowena transforms Jack into a dog so that he can steal antivenom from a vet's office so that Rowena can create an antidote for gorgon venom. In the process, Rowena senses the magic that is keeping Jack alive and warns Sam that "it's volatile magic, powerful, and it's stitched to him like some kind of parasite." In the confrontation that follows, Noah proves to be more than a match for both Jack and Castiel, infecting Castiel with his poison and knocking Dean out when the Winchesters try to intervene. Jack manages to kill Noah with a silver machete as he tries to escape, but is forced to tap into the power of his soul again to heal Castiel when the antidote fails to work on the angel.

After returning to the bunker with the still-unconscious Dean, Jack is left worried by Noah's words towards Jack regarding Noah's ability to foresee his fate. Jack adopts Noah's snake Felix as his own pet and is comforted by Castiel about the realities of being an immortal being and what that means for their human friends and family.

Dean suddenly awakens and reveals that Michael is no longer inside of him. Possessing Rowena, Michael slaughters Maggie and the other hunters in the bunker before he begins torturing the Winchesters and Castiel as Jack helplessly watches. Unwilling to stand by and do nothing, Jack uses the power of his soul to attack Michael, who taunts Jack. Becoming less and less affected by Michael's attacks, Jack declares his identity as the son of Lucifer, a hunter, and a Winchester before exorcising Michael from Rowena. Declaring that the archangel will never harm anyone again, Jack burns away Michael's incorporeal form, killing him.

Jack uses his soul to burn Michael away, leaving only his grace behind.

As Michael is destroyed, Jack absorbs his grace and announces that not only is Michael dead, Jack's original powers as a Nephilim have been restored as well. As a demonstration of his restored powers, Jack displays his wings.

Worried about Jack with his powers back, Sam and Dean ask Jack to stay behind during a case, asking him to help resupply the Bunker.

Going into town, Jack finds that the mini-mart is closed for lunch. As he is about to leave he is noticed by Stacy, Max, and Eliot, who reveal they know about Sam and Dean and how they hunt ghosts and monsters. While shopping, Eliot questions Jack about various monsters. At the check out, Jack is invited to the old farm house to hang out with the three later that day.

Jack arrives at the farm house with lore books from the Bunker for Eliot. He begins questioning the teens about the music they are listening to and what the SATs are. When Eliot asks Jack about how demons look, he reveals to them that anyone can be possessed by a demons and that he has killed one, which prompts Max to ask how. Outside Jack shows the three an angel blade, and after multiple attempts to throw it into a tree fail, Jack uses his powers to telekinetically throw the blade and fly it around, which begins to make the others nervous. Jack assures them that they'll be fine and he is in control, but an afraid Stacy accidentally runs into the path of the flying blade, critically injuring her. As the others try and tend to her, Jack removes the blade from her gut and heals her. But the damage is done, and Max, Stacy, and Eliot want nothing to do with him anymore and leave.

Back at the Bunker, Sam and Dean come clean with Jack about their reservations regarding his powers, leading to Sam and Dean asking Jack to not use his powers without permission.

In the Bunker kitchen, Jack prepares some popcorn for game night. Mary begins questioning him about his soul, but Jack quickly tells her he is fine and annoyed by everyone asking him about it. As they go into the library, and wait for Sam to return with the pizzas, game night is interrupted by a voicemail from Donatello pleading Sam and Dean for help. Dean tells Jack to stay behind for Sam while he and Mary go to Donatello's home to see what happened. When Sam returns, he and Jack begin trying to decipher the language Donatello is speaking in his message.

Dean and Mary return to the Bunker with Nick in tow. During their interrogation, Nick wishes to talk with Jack in exchange for Donatello's location. Mary and Dean are against it, but Jack is willing as he wants to help Donatello and with Sam's support he goes to speak with Nick in the dungeon. Nick tells Jack about how much Lucifer actually did love him, and soon begins to egg him on about not having a soul anymore. This angers Jack, bringing him closer to Nick, allowing Nick to headbutt him and cause Jack to bleed. After healing himself, Jack approaches Nick with menace and soon emerges, telling the Winchesters that Nick will take them to Donatello's location.

Using Jack's blood for a spell to resurrect Lucifer from the Empty, Jack's blood begins to burn, and with Mary's permission he uses his powers to teleport them to Nick's location. Arriving just as Lucifer is about to reunite with Nick, Jack banishes his father back to the Empty and turns his attention to Nick, violently breaking Nick's hand before causing Nick to burn from the inside out, killing him. The brutality of Nick's death shocks Mary, who tells Jack to go help the injured Sam. After healing Sam of his head injury, he returns to the cabin to find Mary outside. He attempts to explain why he killed Nick, but Mary tells him that something is wrong with him, and that she, Sams and Dean will help. Jack refuses to listen to Mary, and begins hearing noises in his head, screaming to be left alone as Mary continues to try to understand what's wrong. He screame at Mary one last time to be left alone.

"I killed Mary. It was an accident. I didn't mean to. I just -- I just wanted her to be quiet. I just wanted her gone, but only for a second. And I just... I thought it. It all happened so fast. I need to undo it."

After accidentally killing Mary, Jack begins teleporting around the globe in a panic before eventually returning to the cabin and collapsing. As he begins to have memories of Mary, Lucifer appears in the doorway of the cabin and tells Jack that he isn't actually Nick or his father, but a manifestation of Jack's subconscious that Jack created to help him figure out what to do about his killing of Mary. Jack refuses its help and forces the manifestation to vanish.

Jack then pays a visit to Rowena's flat, where he tells her what happened to Mary and demands her help to use magic to bring her back. Rowena agrees, but Jack soon realizes that she had been stalling him for Sam and Dean to arrive and swiftly teleports them to the Bunker so Rowena can collect the needed ingredients. While Rowena is preparing the spell, Jack is visited by Lucifer once more, who tells him that the sooner Jack admits that he feels nothing the better he will feel, causing Jack to once again banish him in anger.

With the spell ready, Jack takes Rowena to the site of Mary's death. But due to there not being a body, Rowena tells Jack she won't perform the spell. Frustrated, Jack tells her he will do it. But Rowena warns that he is in no mental condition to attempt such a spell, telling him he could end up bringing something terrible back. Jack disregards Rowena's warnings, and sends her back to her flat and begins performing the ritual. As a purple vortex forms above the blast site, Sam and Dean arrives to the cabin, but Jack is able to stall the Impala to give him more time to finish the spell. Sam and Dean race to Jack only to have him tell them it "didn't work" before disappearing, leaving only a copy of Mary's body behind.

"I've been working with the angels to purify the world. Oh, and making angels. Yeah. I make angels. But I really missed you guys."

Still distressed over his part in Mary's death, Jack sits alone in a warehouse and asks for his mother to help him, instead he is met by his subconscious manifestation of his father, who tells them that the Winchesters hate him now and he needs to understand he is all he has left.

Some time later Jack is met by Dumah, who tells him Mary's death was a mistake and he isn't beyond redemption, and offers him a place in Heaven so as to make the world a better place, assuring him that will make Sam and Dean happy. The two travel to Columbus, Ohio where Dumah demands that atheist professor Harrison Tate rebuke his belief and tell his followers that God is good. When Tate refuses, Jack uses his powers to turn the professor into a pillar of salt.

Dumah then has Jack take her to Heaven, where she tells Jack that they are in dire need of more angels. While Jack can't create them out of thin air, he can forge angels from human souls. Dumah brings him to Heaven's Throne Room, telling Jack it is where his grandfather received prayers and tells him to listen for any people willing to become angels. Jack proceeds to sit on the throne, and begins to hear various prayers, eventually picking up on a church group. He teleports to the church where the meeting is taking place and offers the members if they wish to become angels, unfurling his wings to their awe. When the church pastor, Ames, enters he finds the members sitting frozen and unresponsive. When Jack tells him he is taking them to Heaven to become angels, Ames doesn't believe him and demands he leave his church. But Jack, believing Ames is interfering in Heaven's work inflicts him with a biblical curse, causing worms to writhe from cuts all over his body before teleporting himself and the church group away.

In Heaven Jack proceeds to forge the humans he has chosen into angels, when he is surprised by the sudden arrival of Castiel and happily tells him he is making angels. As Castiel steals Dumah away into the hall, Jack hears a prayer from Sam inviting him back home. When Jack teleports back to the Bunker, he attempts to explain the "incident" with Mary was an accident, Jack referring to it as an "incident" visibly angers Dean, who is able to hold his rage back. They tell Jack they forgive and tell him they are close to find a solution to fix his soul, but they need to keep him safe from everyone by placing him in the Ma'lak Box. Jack agrees and once inside the box, Dean locks him and he and Sam leave Jack in the box in a locked room.

Inside the box, Jack begins calling for Sam and Dean, his calls eventually turn to panic, leading to the appearance of Lucifer, telling Jack he has been played by Sam and Dean, and that they have locked him away for the rest of time. Angry, Jack begins tapping into his powers, causing the box to shake and eventually explode, causing alarms to go off in the Bunker. When Sam, Dean and Castiel arrive in the storage room, they find the Ma'lak Box destroyed and Jack appearing out of the smoke, eyes glowing gold.

"All I ever wanted was to be good. But now I'm just empty. Even this -- I know you're here because you love me, and I want to love you back. It's just I can't."

After escaping from the Ma'lak Box, a distressed Jack flings the Winchesters and Castiel away with telekinesis before teleporting away. Wandering the world, Jack becomes distressed at everyone always lying and orders everyone to stop, leading to a worldwide inability to fudge the truth. Next, Jack attempts to visit his grandparents, but learns from Mrs. Kline that they discovered Jack had lied about who he was during his last visit. She demands to know who he is and what he's done with Kelly. Upset, Jack orders his grandmother to stop, eyes glowing, but departs without harming her.

As a distressed Castiel waits in a cemetery, Jack teleports in behind him and the two hug. They walk through the cemetery and Jack explains to Castiel that he thought he could make the world a better place if no one could lie, but he recognizes that it really didn't work. He also details his visit with his grandmother. Jack admits after accidentally killing Mary, he was manipulated by Dumah and then tried to do the right thing on his own, but none of it went right. Jack is disturbed by the fact that his every attempt to be good has failed and says he no longer feels anything no matter how much he wants to.

When Dean arrives with the Equalizer to kill Jack, Jack refuses to run and flings Castiel aside so that he won't get hurt. Jack kneels on the ground before Dean and expresses understanding for what Dean is about to do, stating that he knows what he has done and that Dean has been right all along and Jack is a monster. However, Dean can't bring himself to kill Jack and instead throws away the gun. Chuck demands that Dean kill Jack and Sam realizes that Chuck has been playing them all along. Even though Chuck offers to bring back Mary if Dean kills Jack, Dean refuses, knowing that Mary would never want that. With the Winchesters continuing to refuse to cooperate, Chuck snaps his fingers and smites Jack, leaving Jack with his eyes burned out and surrounded by the imprint of his wings. Devastated, Sam, Dean, and Castiel stand over Jack's body before Chuck raises the souls of Hell, along with zombies, to attack them.

After being killed, Jack awakens in the Empty. He is greeted there by the Cosmic Entity, who appears to Jack in the form of a black, viscous humanoid. The entity forms a smile on its face at the sight of Jack, who asks what had happened. Billie appears behind Jack and tells him that they should talk about that.

Trivia

Jack is not called by his full name until 14.07 Unhuman Nature when the Winchesters and Castiel are forced to take him to the hospital. At the time, his birthdate is given as May 18, 2000, making his current claimed age as eighteen. When giving the year, Dean fluctuates between 1999 and 2000 before settling on 2000. May 18th is Jack's actual birthday, but the year was adjusted to make his age more plausible. Later in 14.16 Don't Go in the Woods, he lies about being 22 to buy beer and keep his new friends from knowing the truth about his nature.